Process for refining and discoloring of raw sulphate soft soap



Patented Nov. 8, 1932 UNITED STATES PATENT OFFICE EVALD PYEALA, orOULUNKYLA, UUSIMAA, FINLAND, ASSIGNOB T0 0. Y. METHODS LTD., or vnruar,FINLAND, A coarona'rron or FINLAND PROCESS FOR REFINING AND DISCOLORING01 RAW SULPHATE SOFT SOAP R0 Drawing. Application filed September 8,1931, Serial No. 561,700, and in Finland August 5, 1981.

The invention relates to refining of the black evil-smelling raw soapsolution or soap obtained as by-product in the producing of sulphatepulp the object of the refining being to procure soft soap suitable fordifferent purposes in the practical life, in doing which the soda usedin the production of the sulphate pulp is utilized in the soap in such amanner that the evil-smelling and black substances present in the rawmaterial for the most part are removed and that the remaining substancesare destroyed or converted into substances easily volatilized by boilingwhile the soap is getting lighter. According to the invention the soapsolutioneither the natural one or the soap solution produced from theraw soa by solution in water-is cleansed from pulp bres by filtration orin any other way and then treated with of hydrogen peroxide of astrength of or with any other means of oxidation, subsequently named,preferably in hot or boiling condition while mixing constantly. Herebythe evilsmelling and black substances present in the sulphate raw soapare transformed into com-.

pounds which for the most part are very soluble in water and in saltsolutions so that they by addition of either common salt or sodiumsulphate can be caused to remain in the black bottom water collectedfrom the soap solution under the separated (salted) soap, the bottomwater being then removed. The partly refined soap obtained by thetreatment is dissolved in water for instance in proportion 1 1 whilemixing and heating. The lumpless clear soap solution thus obtained istreated in hot or boiling condition with peroxides, either theirsolutions such as hydrogen peroxide of 30% strength or their mixtures orwith other oxygen emitting substances such as perborates or oxygen-gasas well as with alkali hypochlorites or alkali hyposulphites or with anyother substances acting in the same manner as these, the treating ofthesesubstances being performed in one single or in several operations.The substances developed by the different operations from the impuritiescan'be removed in the above-mentioned manner of salting and bytapping ofthe bottom water whereat the removing operation is tion of 50% strengthis heated to 8090- C. or to the boiling point additioning to the same inseparate doses about of hydrogen peroxide of 30% strength (calculated onthe quantity of soap in the solution) while mixing constantly. Hereafterto the soap solution is additioned such a great quantity of salt thatthe soap after some cooling of the soap solution, difi'ers to a separatelayer under which the black bottom water has collected.

After a most careful tapping of this bottom water to the soap beingtreated water is additioned while mixing and heating so that a soapsolution of about 50% strength is obtained. To the hot or boiling soapsolution thus obtained a quantity in total of 2 of hydro en peroxide of30% strength calculated on t e quantity of the soap is additioned inseveral doses while mixing constantly. A smaller or greater quantity ofhydrogen peroxide can be used owing to the quality of the soap desired.During the additioning of hydro en peroxide the heating can beinterrupte and the reaction mixtures can remain standing for a shorteror longer period. After this the soap is salted and the separated bottomwater is tapped in the same way as previously. Finally the soap can bewashed by mixing it with a small quantity of cold water which then isseparated by admixture of salt and tapped away as bottom water.

(2) Referring to the above-mentioned treatment with 25% e. g. 2 ofhydrogen peroxide of 30% strength the same can be mixing and heating inwater to a soap solu-. tion of about 50% strength into which isadditioned while mixing for instance 100% of a Solution of sodiumhypochlorite containing about 2%% of active chlorine. Hereafter thebleached soap is salted and the separated bottom water is ta ped away.

(4) The soap 0 tained according to the mode of procedure described inthe clauses l, 2 or 3 is emulsed in a water solution either in cold, hotor boiling condition with for instance a more or less strong orpreferable concentrated solution of sodium hyposulhite. In doing thisthe soap is furthermore leached and the finally bleached soap-productseparates automatically when the emulsion is left standing if a solutionof concentrated sodium hyposulphite has been used, a case in whichaccordingly there is no need of salting. The separated'solution of thebot tom water can be reused for treatment of new quantities of soapuntil it has lost its effect.

What I claim as my invention and desire to secure by Letters-Patent is:

1. A process for refining and discoloring of raw sulphate soft soap,comprising treating a solution of, raw soap, or a solution of e. g. 50%'stren h, produced by redissolving of the raw so t soap, preferably inboiling condition with about of peroxides, for instance hydrogenperoxide of strength, calculated on the quantity of rawsoap, mix-- ingconstantly and subsequently salting the reaction solution, tapping ofthe bottom water, washing of the soap with a small quantity of water,salting and then tapping the washing water from the separated soaprefined and discolored.

2. A process for refining and discoloring of raw sulphate soft soap,comprising treating a solution of raw soap of e. g. strength withperoxides preferably dissolved,

calculated on thequantity of raw soap, salting the reaction solution,tapping the bottom water, treating the separated soap redissolved with2-5% e. g. 2 of peroxides, for instance hydrogen peroxide of 30%strength, 1 while mixing constantly, where upon salting and then tappingthe bottom water from the separated soap refined and discolored.

3. A process for refining and discoloring of raw sulphate soft soap,comprising prerefining a solution of raw soap with of peroxidespreferably dissolved, calculated on. the quantity of raw soap,salting-separating of the soap, refining this soap redissolved with 2-5%of hydrogen peroxide and saltingseparating of this soap, treating of theredissolved soap so obtained with hypochlorites, for instance sodiumhypochlorite with 2 of active chlorine calculated on the quantity ofsoap being treated salting the reaction solution and tapping oil thebottom water from the refined-discolored soap s0 separated.

4. A process for refining and discoloring of raw sulphate soft soap inthe cases, when a partial oxydation already has taken place by thecooking of the sulphate pulp so that the evil-smelling black substancesby salting only can be removed from the soap, as being soluble in thebottom water to be tapped away, comprising treating a solution of theredissolved soap with 2 of peroxides preferably dissolved, calculated onthe quantity of the soap being treated, salting and then separating therefined discolored soap from the bottom water to be tapped away.

' 5. A process for refining and discoloring of raw sulphate soft soap,comprising prerefining-discoloring the raw soap solution with about ofperoxides preferably dissolved calculated on the quantity of the soabeing treated salting and then separating t e prerefined soap,dissolving this soap, treating the soap solution with 2-5% of peroxidespreferably dissolved calculated on the quantityof i the soap soattained, redissolving of this soap EVALD PYHALA.

